<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

    <script src="jquery-3.3.1.min.js"></script>
</head>
<body>
<form method="post">
    名字：
    <input type="text" name="name" required>
    <input type="submit">
</form>

<script src="async.js"></script>
</body>
</html>